Welding rod



PM June 14, I

UNITED STATES PATENT OFFICE.

.1 smcrrann on, of anionic, minors, ASSIGNOB r rusron wamfmre consonanor, or cmcaeo, rumors, a conronarrrou or rumors.

moms non.

- My invention, which is of particular importance in connection with the manufacture of welding rods, resides in the discovery 'of *-a heretofore unreco ized, but actively a sought for and highly important factor which I have found to be responsible in large i measure for the'lack of uniformity obtained in the operating characteristics and weld pro rties given by different ferrous metal ,lfif wel 'ng rods having the same chemical composition and the same carbon content,

As is known, when carbon is combined" with iron or other ferrous metal, such as manganese, the resulting carbide assumes either what is known as a perlitic form, in which it, exists in extremely-thin laminar plates so arated by ferrite, or what is known as aglo ular or massive form, in which it has less surface area. In any particular piece of metal containing carbon, the caride may be all in rlitic'form, all in glob'- ular form, or part y in perlitic and partly in globular form, either mixed or l0calized.'

' The form in which the carbon is present depends upon the manner inwhich the metal with the carbon therein is produced and v worked. I v

Heretofore it has been supposed that the operating characteristics and weld pro rties given by welding rodsare depen ent a I have vered, however, thatwhi-le the composition of the rod and the composition and proportioning of the flux coatingfare of considerable importance, uniformity-cf ac- .tion in weldin with a rod offerrousymetal containing car ide canonlybe obtained,

other factors and conditions be uniform, when some, art or all of the" ide in the metal exists m globular as distinguished from perlitic form. Such factor. in sofar as the art of welding is concern has heretofore no attention, 'as thereis nothing in,

a coating is'used;

containin -containin carbide, the ma'or alizjed po mliflfllll fled leptember so, me. man No. 130,725.

the different forms of the'carbide to indicate that the same might have any influence on the results obtained in welding.

In both the electric arc and gas torch rocesses of fusion Welding, carbon is burn out of the weldin rod by the action of the air to a marked egree and, during'such burning, the incident chemical reaction causes a commotion of the metal in the fusion zone which interferes with the smooth flow of the that thegreater surface area of the carbide when in perlitic form offers a proportionally greater air contact during the flow of the metal. The differences in the uniformity of results are especially noticeable when the rod is used as a metallic arc electrode. The carbide, when present in an electrode in per-. litic form, causes the arc to flit around, and, when present in globular'form, causes it to concentrate and become readilymanageable. I have found that the ter the percentage of the total carbide which is present-in glo 6 ular form, the steadier the arc.

I claim:

1. A welding rod .or wire of ferrous metal carbide, the major portion of which car ide-is in globular form. e

2. A welding rod or wire of ferrous metal containing carbide, the major portion' of which 'carbidein any localized part of the cross section is in Iobular form.

3. A welding r0 or wire of ferrous metal .0

portion of which car ide in the loc rtion of the rod or wire most apt to result in air contact Y is in globular form.

In testimony whereof I have hereunto subscribed my name.

J me es GREEN. 

